INA241B3QDRQ1

Overview

The INA241B3QDRQ1 is an AEC-Q100 qualified, bidirectional current sense amplifier with a gain of 50 V/V. It operates over a common-mode voltage range of -5V to 110V and supports supply voltages from 2.7V to 20V. The device features enhanced PWM rejection for switching systems up to 125kHz, a small-signal bandwidth of 1.1MHz, and a slew rate of 8V/µs. Key electrical characteristics include a maximum gain error of ±0.1%, a maximum offset voltage of ±150µV, and a typical DC CMRR of 130dB. It is housed in an SOIC-8 package.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbance caused by large common-mode voltage transients at the inputs.
• Bidirectional operation allows accurate measurement of voltage drops across shunt resistors independent of the power supply voltage.
• High small-signal bandwidth ensures fast response times required for rapid detection and processing of over-current events.

Applications

• Electric power steering (EPS)
• Starter/generator systems
• Regenerative braking circuits

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the gain configuration aligns with system requirements. Ensure compliance with automotive functional safety documentation if applicable. Check for any recent datasheet revisions affecting specifications.

Selection Notes

Select this component when high precision is required in high-voltage environments with significant common-mode noise. The 50 V/V gain suits applications needing moderate amplification. Consider the SOIC-8 package for standard surface-mount assembly. Evaluate thermal performance based on the junction-to-ambient resistance for the chosen layout.

Part Context

This part belongs to the INA241x-Q1 family of ultra-precise current sense amplifiers designed for automotive applications. It shares architectural similarities with other gains in the series but offers a specific 50 V/V amplification factor. The Q1 designation indicates qualification for automotive use under AEC-Q100 standards.

Replacement Considerations

Other members of the INA241x-Q1 family may serve as alternatives if different gain factors are acceptable. Verify pin compatibility and package dimensions before substitution. Ensure the replacement meets the same AEC-Q100 temperature grade requirements.